Search results

  1. K

    1957 evinrude fastwin 18hp ventilation problems.

    @Texasmark What size boat did you use to waterski behind with the 18?
  2. K

    1957 evinrude fastwin 18hp ventilation problems.

    I'm so confused now lol what are the downsides of having the transom cut down besides obvious structural integrity. And my prop is pretty beat up. Could it just be so bad that it is cavitation bad enough to the point of ventilation? I know it's not a spin hub cause I marked the cotter pin and...
  3. K

    1957 evinrude fastwin 18hp ventilation problems.

    Ive watched a lot of videos and from what I can see the cavitation plate or technically the ventilation plate is either level with bottom of the boat or below it a few inches. And every transom depth diagram I look at they say the plate should be at least 3 inches below transom.
  4. K

    1957 evinrude fastwin 18hp ventilation problems.

    I've seen people with same problem cut off as little as 2 3/4 inches to make it work but where mine sits I think cutting 4 inches would suit it better.
  5. K

    1957 evinrude fastwin 18hp ventilation problems.

    I know the "setup" is a bit rudimentary but it's only temporary. You can see splash well here.
  6. K

    1957 evinrude fastwin 18hp ventilation problems.

    It does have a splash well. About 6 inches below transom.
  7. K

    1957 evinrude fastwin 18hp ventilation problems.

    I understand now, thank you for the help. I'm going to try to find parts for it now through omci. Hopefully it's not to big of a job.
  8. K

    1957 evinrude fastwin 18hp ventilation problems.

    Disregard previous post. I now see that you only measure to where the lower end bolts up.
  9. K

    1957 evinrude fastwin 18hp ventilation problems.

    I do not believe it is a 15 inch shaft either. Look at my pic with measuring tape. I may be mistaken but that looks to be a 20" shaft.
  10. K

    1957 evinrude fastwin 18hp ventilation problems.

    Is that something that I can convert motor to? Or does that mean I can't use this motor on boat?
  11. K

    1957 evinrude fastwin 18hp ventilation problems.

    I don't believe it does. When me and another person stand at back of boat up to half throttle it's fine. If we walk to front of boat at half throttle it immediately starts feeling like a tranny slipping and I looked at back of boat while going and it doesn't appear to have enough water in the...
  12. K

    1957 evinrude fastwin 18hp ventilation problems.

    The 1957 evinrude fastwin 18hp I have on my 66 alumacraft maracaibo is having cavitation problems. Can't get motor above quarter throttle before it starts pushing air and losing thrust. I have a 16 inch depth from transom to water line and I believe the motor has a 20 inch shaft. How do I keep...
  13. K

    Question: 1957 18hp Johnson

    If so, could you educate me?
  14. K

    Question: 1957 18hp Johnson

    The parts for the older motors when machined, varied by up to ten thousandths of an inch. Newer motors now only have a tolerance around one thousandth of an inch. So the gaps between rings and cylinder walls on earlier motors was much larger and needed to have thicker oil so it didn't blow by...
  15. K

    1963 Aluma Craft Maracaibo 14'

    My 66 maracaibo came factory with big block of styro under bow and smaller strips in gunwhales. Nothing under floor due to the curvature.
  16. K

    Question: 1957 18hp Johnson

    I bought the 57 evinrude fastwin 18hp on a 66 alumacraft maracaibo 14.6ft. guy took $900 for it due to carb issues and some minor sealing on the transom of boat. I took it home and adjusted the high and low speeds to factory spec and it runs amazingly. Wouldn't trade it for anything. Came with...
View older results
Top